Diver discovers incredible underwater river in Mexico

Anatoly Beloshchin is a professional photographer and diver.
Recently he travelled to Mexico, and dove in the Cenote Angelita. Another name
for cenote is sinkhole, and it's formed by the collapse of cave walls. The floor
of these natural wells is covered with water. An exciting fact is that cenotes
are mostly found in Mexico. Anatoly managed to take photos of a truly unique
natural phenomenon when diving: an underwater river.

The deep sinkholes of the cenotes have filled with fresh
rain water. Sea water rich in hydrogen sulfide is much heavier than ordinary
water. Because of this, it sinks down and forms a stream, looking exactly like
a real river on the surface. The underwater river is formed when the fresh top
water meets the exposed salty groundwater.
The different density level in the two waters causes them to layer.

To take photos, the diver had to dive down to a depth of 60
meters underwater. If you take a closer look, you can see sand banks, snags, and
fallen leaves. All in all, it looks just like an ordinary river.